[CHANGE ME] Re-generated Container to pick up changes in the API or client library generator.

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Cloning googleapis.
synthtool > Running generator for google/container/artman_container_v1.yaml.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:229601142daed005bf56fbaa21a02cf7aa0b261b57677d38306f8013e536de7a
Status: Image is up to date for googleapis/artman:latest
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/php/google-cloud-container-v1.
synthtool > Replaced 'Copyright \\d{4}' in src/V1/Gapic/ClusterManagerGapicClient.php.
synthtool > Replaced 'Copyright \\d{4}' in src/V1/ClusterManagerClient.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V1/ClusterManagerClientTest.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/System/V1/ClusterManagerSmokeTest.php.
synthtool > Cleaned up 1 temporary directories.

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[jdpedrie]

need to wait until googleapis/gapic-generator#2416 is released.